• With the TAB-key you may step from one input box to the next one, and with SHIFT-TAB to the previous one. You may also mark a box or a character with the mouse to change it.
  • We have pre-selected the current date; you may change it to any date from January 1965. However, only the respective month is essential for the calculation. Don't be surprised that the calculated dose during a month does not change for a selected flight.
  • You may also look a little into the future: We use the trend of the solar activity observed for extrapolation for one year in advance. Until then any input date is accepted.
  • The input of the flight ID number is of no relevance and may be omitted.
  • Airports of departure and destination: You may select those by using the first character of the city (left hand box) or with the first character of the airport code (right hand box). Then select the airport with the mouse. You may find the three-character code on the tag of your luggage; the four characters describe the international ICAO-code.
  • The calculations are always conducted for the course of a single non-stop flight from the moment of take-off to touch down.
  • We have pre-selected a few other boxes: The first of the alphabet (AAR) is used for departure; the last one in the alphabet (ZYL) is selected for destination. We selected 30 min as time of ascent from take-off to the first flight level, and also 30 min for descending from the (last) flight level to the destination. We selected 10 000 m (ca. 33 000 ft) as a first guess of the first or an average flight level. We selected only one flight level for a first estimate. If there is any better information available, e.g. form a screen in the cabin, you may change this value and select a flight altitude profile of up to 12 flight levels.
  • Values of flight altitudes may range from 5000 m to 25000 m, and from 16000 ft to 80000 ft, respectively.
  • Later on you will be asked to key in the times at the respective flight altitudes.
  • We are gratified on receiving your e-mail address. This may facilitate the analysis, if an error occurred. You may also chose any arbitrary address, e.g. a@a.
  • The "Default values" are those of your last calculation, if your browser does accept a so-called cookie. Otherwise the above mentioned pre-selected values will be used.